#!/usr/bin/env bash
# Complete Cloudflare configuration for Blockscout Explorer
# Attempts API configuration, falls back to manual instructions

set -euo pipefail

DOMAIN="${DOMAIN:-d-bis.org}"
EXPLORER_DOMAIN="explorer.d-bis.org"
EXPLORER_IP="${EXPLORER_IP:-192.168.11.140}"
EXPLORER_PORT="${EXPLORER_PORT:-80}"
TUNNEL_ID="${TUNNEL_ID:-10ab22da-8ea3-4e2e-a896-27ece2211a05}"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
NC='\033[0m'

log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[✓]${NC} $1"; }
log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }
log_section() { echo -e "${CYAN}════════════════════════════════════════${NC}"; }

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ENV_FILE="${ENV_FILE:-$SCRIPT_DIR/../.env}"

log_section
log_info "Cloudflare Configuration for Blockscout Explorer"
log_section
echo ""

log_info "Domain: $EXPLORER_DOMAIN"
log_info "Target: http://$EXPLORER_IP:$EXPLORER_PORT"
log_info "Tunnel ID: $TUNNEL_ID"
echo ""

# Load environment variables if .env exists
if [ -f "$ENV_FILE" ]; then
    source "$ENV_FILE"
fi

CLOUDFLARE_API_TOKEN="${CLOUDFLARE_API_TOKEN:-}"
CLOUDFLARE_API_KEY="${CLOUDFLARE_API_KEY:-}"
CLOUDFLARE_EMAIL="${CLOUDFLARE_EMAIL:-}"

# Check if we can use API (support both API Token and API Key methods)
USE_API=false
AUTH_METHOD=""

if [ -n "$CLOUDFLARE_API_TOKEN" ]; then
    USE_API=true
    AUTH_METHOD="token"
    log_info "API Token found - attempting automated configuration..."
elif [ -n "$CLOUDFLARE_API_KEY" ] && [ -n "$CLOUDFLARE_EMAIL" ]; then
    USE_API=true
    AUTH_METHOD="key"
    log_info "API Key + Email found - attempting automated configuration..."
else
    log_warn "No API credentials found - will provide manual instructions"
fi

# Set auth headers based on method
if [ "$AUTH_METHOD" = "token" ]; then
    AUTH_HEADER="Authorization: Bearer $CLOUDFLARE_API_TOKEN"
elif [ "$AUTH_METHOD" = "key" ]; then
    AUTH_HEADER="X-Auth-Email: $CLOUDFLARE_EMAIL
X-Auth-Key: $CLOUDFLARE_API_KEY"
fi

# Function to configure DNS via API
configure_dns_api() {
    local zone_id="$1"
    local target="${TUNNEL_ID}.cfargotunnel.com"
    
    log_info "Configuring DNS record via API..."
    
    # Build curl headers based on auth method
    local curl_headers=(-H "Content-Type: application/json")
    if [ "$AUTH_METHOD" = "token" ]; then
        curl_headers+=(-H "Authorization: Bearer $CLOUDFLARE_API_TOKEN")
    elif [ "$AUTH_METHOD" = "key" ]; then
        curl_headers+=(-H "X-Auth-Email: $CLOUDFLARE_EMAIL")
        curl_headers+=(-H "X-Auth-Key: $CLOUDFLARE_API_KEY")
    fi
    
    # Check if record exists (any type)
    local response=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?name=$EXPLORER_DOMAIN" \
        "${curl_headers[@]}")
    
    local record_id=$(echo "$response" | jq -r '.result[0].id // empty' 2>/dev/null || echo "")
    local existing_type=$(echo "$response" | jq -r '.result[0].type // empty' 2>/dev/null || echo "")
    
    local data=$(jq -n \
        --arg name "explorer" \
        --arg target "$target" \
        '{
            type: "CNAME",
            name: $name,
            content: $target,
            proxied: true,
            ttl: 1
        }')
    
    if [ -n "$record_id" ] && [ "$record_id" != "null" ]; then
        log_info "Found existing DNS record (type: ${existing_type:-unknown}, ID: $record_id)"
        if [ "$existing_type" != "CNAME" ]; then
            log_warn "Existing record is type $existing_type, deleting and creating CNAME..."
            curl -s -X DELETE "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$record_id" \
                "${curl_headers[@]}" >/dev/null 2>&1
            log_info "Creating new CNAME record..."
            response=$(curl -s -X POST "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
                "${curl_headers[@]}" \
                --data "$data")
        else
            log_info "Updating existing CNAME record..."
            response=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$record_id" \
                "${curl_headers[@]}" \
                --data "$data")
        fi
    else
        log_info "Creating new DNS record..."
        response=$(curl -s -X POST "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
            "${curl_headers[@]}" \
            --data "$data")
    fi
    
    if echo "$response" | jq -e '.success' >/dev/null 2>&1; then
        log_success "DNS record configured successfully"
        return 0
    else
        local error=$(echo "$response" | jq -r '.errors[0].message // "Unknown error"' 2>/dev/null || echo "API call failed")
        log_error "Failed to configure DNS: $error"
        return 1
    fi
}

# Try API configuration if credentials available
if [ "$USE_API" = "true" ]; then
    log_section
    log_info "Step 1: Getting Zone ID"
    log_section
    
    # Use provided ZONE_ID if available, otherwise fetch it
    if [ -n "${CLOUDFLARE_ZONE_ID:-}" ]; then
        ZONE_ID="$CLOUDFLARE_ZONE_ID"
        log_info "Using provided Zone ID: $ZONE_ID"
    else
        # Build curl command based on auth method
        if [ "$AUTH_METHOD" = "token" ]; then
            ZONE_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$DOMAIN" \
                -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
                -H "Content-Type: application/json" | jq -r '.result[0].id // empty' 2>/dev/null || echo "")
        elif [ "$AUTH_METHOD" = "key" ]; then
            ZONE_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$DOMAIN" \
                -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
                -H "X-Auth-Key: $CLOUDFLARE_API_KEY" \
                -H "Content-Type: application/json" | jq -r '.result[0].id // empty' 2>/dev/null || echo "")
        fi
    fi
    
    if [ -n "$ZONE_ID" ] && [ "$ZONE_ID" != "null" ]; then
        log_success "Zone ID: $ZONE_ID"
        
        log_section
        log_info "Step 2: Configuring DNS Record"
        log_section
        
        if configure_dns_api "$ZONE_ID"; then
            log_success "DNS configuration complete via API!"
            DNS_CONFIGURED=true
        else
            log_warn "API DNS configuration failed, falling back to manual"
            DNS_CONFIGURED=false
        fi
    else
        log_error "Failed to get zone ID"
        DNS_CONFIGURED=false
    fi
else
    DNS_CONFIGURED=false
fi

# Tunnel route configuration (always requires manual or complex API)
log_section
log_info "Step 3: Tunnel Route Configuration"
log_section

log_warn "Tunnel route configuration requires manual setup in Cloudflare Zero Trust Dashboard"
echo ""
log_info "Instructions:"
echo ""
echo "1. Go to: https://one.dash.cloudflare.com/"
echo "2. Navigate to: Zero Trust → Networks → Tunnels"
echo "3. Select your tunnel (ID: $TUNNEL_ID)"
echo "4. Click 'Configure' → 'Public Hostnames'"
echo "5. Click 'Add a public hostname'"
echo "6. Configure:"
echo "   - Subdomain: explorer"
echo "   - Domain: $DOMAIN"
echo "   - Service: http://$EXPLORER_IP:$EXPLORER_PORT"
echo "   - Type: HTTP"
echo "7. Click 'Save hostname'"
echo ""

# Manual DNS instructions if API didn't work
if [ "$DNS_CONFIGURED" != "true" ]; then
    log_section
    log_info "Step 2: DNS Record Configuration (Manual)"
    log_section
    
    log_info "Go to: https://dash.cloudflare.com/"
    log_info "Navigate to: $DOMAIN → DNS → Records → Add record"
    echo ""
    echo "Configure:"
    echo "  Type: CNAME"
    echo "  Name: explorer"
    echo "  Target: ${TUNNEL_ID}.cfargotunnel.com"
    echo "  Proxy status: 🟠 Proxied (orange cloud) - REQUIRED"
    echo "  TTL: Auto"
    echo ""
    log_warn "IMPORTANT: Proxy must be enabled (orange cloud) for tunnel to work!"
    echo ""
fi

# Summary
log_section
log_info "Configuration Summary"
log_section

if [ "$DNS_CONFIGURED" = "true" ]; then
    log_success "DNS Record: ✅ Configured via API"
else
    log_warn "DNS Record: ⚠️ Needs manual configuration"
fi

log_warn "Tunnel Route: ⚠️ Needs manual configuration"

echo ""
log_info "Configuration Details:"
echo "  Domain: $EXPLORER_DOMAIN"
echo "  DNS Target: ${TUNNEL_ID}.cfargotunnel.com"
echo "  Tunnel Service: http://$EXPLORER_IP:$EXPLORER_PORT"
echo ""

# Verification instructions
log_section
log_info "Verification"
log_section

log_info "After configuration, wait 1-5 minutes for DNS propagation, then test:"
echo ""
echo "  curl -I https://$EXPLORER_DOMAIN"
echo "  curl https://$EXPLORER_DOMAIN/health"
echo ""

if [ "$DNS_CONFIGURED" = "true" ]; then
    log_success "Configuration complete! DNS configured, tunnel route pending manual setup."
else
    log_warn "Configuration pending. Please complete DNS and tunnel route setup manually."
fi

echo ""